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A tea bag is a small, porous sealed bag containing tea leaves and used with water for brewing the beverage called tea, or herbs or spices for brewing herbal teas (also known as "tisane"). Tea bags are commonly made of filter paper, silk or food grade plastic. The bag contains the tea leaves while the tea is steeped, making it easier to dispose of the leaves, and performs the same function as a tea infuser. Some tea bags have an attached piece of string with a paper label at the top that assists in removing the bag while also displaying the brand and/or variety of tea. In countries where the use of loose tea leaves is more prevalent, the term tea bag is commonly used to describe paper or foil packaging for loose leaves. They are usually square or rectangular envelopes with the brand name, flavour and decorative patterns printed on them. == History == In China, during the Tang Dynasty (618–907), paper was folded and sewn into square bags to preserve the flavor of tea. The first tea bags were hand-sewn fabric bags; tea bag patents date as early as 1903.〔(【引用サイトリンク】url=http://www.google.com/patents/US723287 ) US patent 723287 was issued on MAR. 24, 1903 to R. G.LAWSON & M. McLAREN for a 'novel tea-holding pocket constructed of open-mesh woven fabric, inexpensively made of cotton thread'.〕 First appearing commercially around 1904, tea bags were successfully marketed by the tea and coffee shop merchant Thomas Sullivan from New York, who shipped his tea bags around the world. The loose tea was intended to be removed from the sample bags by customers, but they found it easier to brew the tea with the tea still enclosed in the porous bags. Modern tea bags are usually made of paper fibre. The heat-sealed paper fiber tea bag was invented by William Hermanson, one of the founders of Technical Papers Corporation of Boston. Hermanson sold his patent to the Salada Tea Company in 1930. The rectangular tea bag was not invented until 1944. Prior to this, tea bags resembled small sacks.〔Dubrin, Beverly (2010). ''Tea Culture: History, Traditions, Celebrations, Recipes & More.'' Charlesbridge Publishing, p. 35. ISBN 1607343630〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「tea bag」の詳細全文を読む スポンサード リンク
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